External Issue: Compilation error "expected expression before" when trying to return generic domain from a class method

Notifications Issues
1

19570, "abhishekingit", "Compilation error "expected expression before" when trying to return generic domain from a class method", "2022-03-30T09:42:43Z"

Summary of Problem

I was trying to write an overriding class method that returns a generic domain, and I came across a generated code compilation error.

Steps to Reproduce

Source Code:

class AbstractParent {
	// less generic fields
	const rank: int;

    proc init(rank: int) {
        this.rank = rank;
    }

	proc getDomain(): domain {
		halt("Pure virutal method");
	}	
}

class DerivedChild: AbstractParent {	
	param rank: int;
	param stridable: bool;
	var dom: domain(rank, stridable = stridable);	
    //generic fields
	
    proc init(size: domain) {
        super.init(size.rank);
        this.rank = size.rank;
        this.stridable = size.stridable;
        this.dom = size;
    }
	
	override proc getDomain(): domain {
		return this.dom;
	}
}

var d1: domain(2) = {1..2, 1..3};
var dervChild1 = new shared DerivedChild(d1);
writeln(dervChild1.getDomain());

Compile command:
chpl test.chpl

Execution command:
./test

Configuration Information

  • Output of chpl --version: chpl version 1.25.0 pre-release (67621f5dd5) built with LLVM version 11.0.1
  • Output of $CHPL_HOME/util/printchplenv --anonymize:
CHPL_TARGET_PLATFORM: linux64
CHPL_TARGET_COMPILER: gnu
CHPL_TARGET_ARCH: x86_64
CHPL_TARGET_CPU: native
CHPL_LOCALE_MODEL: flat
CHPL_COMM: none
CHPL_TASKS: qthreads
CHPL_LAUNCHER: none
CHPL_TIMERS: generic
CHPL_UNWIND: none
CHPL_MEM: jemalloc
CHPL_ATOMICS: cstdlib
CHPL_GMP: bundled
CHPL_HWLOC: bundled +
CHPL_RE2: bundled
CHPL_LLVM: bundled +
CHPL_AUX_FILESYS: none
  • Back-end compiler and version, e.g. gcc --version: gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0